[PATCH v2 1/2] doc/devicetree: Add Aspeed VIC bindings

[Benjamin Herrenschmidt]

On Wed, 2016-05-11 at 09:33 -0500, Rob Herring wrote:
> > +- interrupt-controller : Identifies the node as an interrupt controller
> > +- #interrupt-cells : Specifies the number of cells needed to encode an
> > +  interrupt source. The value shall be 1.
> 
> No need for level vs. edge flags?

That's an open question. Most interrupts are fixed. A handful of GPIOs
can be configured either way. For now I am relying on uboot setting up
the right config for them and I read it back at boot time, but we could
make it part of the binding I suppose.

> > +- valid-sources : bitmask of valid irq sources
> 
> Drop this. Either all interrupt controllers need this or none of 
> them do. The valid sources are the ones described in the DT.

Looking at the code (I wrote that ages ago), this is only used for:

  - Failing map on an unsupported source, so we could drop it

  - Counting the number of sources in order to optimize the
    revmap size allocation. We could unconditionally allocate
    64, I don't see a big deal here.

So yes Joel, feel free to just ditch this.

> > +
> > +Example:
> > +
> > + vic: interrupt-controller {
> 
> Needs a unit address.
> 
> > +      compatible = "aspeed,ast2400-vic";
> > +      interrupt-controller;
> > +      #interrupt-cells = <1>;
> > +      valid-sources = < 0xffffffff 0x0007ffff>;
> > +      reg = <0x1e6c0080 0x80>;
> > + };
> > -- 
> > 2.8.1
> > 
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